Sam Yagan (born April 10, 1977) is an American Internet entrepreneur best known as the co-founder of OkCupid.[1] In 2013, he was named to TIME Magazine's '100 Most Influential People in the World' list.[1] He is the Vice-Chairman of the e-dating site Match.com.[2]

In 1999, during his senior year at Harvard, Yagan and two of his classmates, Chris Coyne and Max Krohn, started the online study guide SparkNotes.[7]Christian Rudder joined shortly after the founding. A year later they sold the company to Barnes & Noble for $30 million.[8]

By age 25 Yagan was the president of eDonkey (founded in 2002), a P2P file-sharing network. As the developer of eDonkey, Yagan testified before the Senate Judiciary Committee expressing a need for balance between innovation and intellectual property.[9]